You mention you had an abortion. I would have them check to make sure there is no scarring,depending on what type of abortion you had, that can affect fertility.
It is possible, but most women with anovulatory cycles are irregular. Sounds like you're pretty regular, though, so I would think you're ovulating. Have you tried OPKs (ovulation perdictor kits)? Or maybe temperature charting? That would give you a better idea on whether or not you ovulate.
Best of luck!